What is he acting like this?

my shih-tzu, “max” is getting close to 1 year old. took him in to be groomed on monday and they cut him real low because he was matted in some places. besides being uncomfortable from itching and scratching, he is not his usual self when it’s time to go out. open the crate and he just sits there when he usually bolts out gleefully. open the door to go out and you almost have to pay him. he LOVES to go outside. what gives?